[SERVER-85017] M/R Agg Design: How will the command be translated to agg? Created: 27/Jun/19  Updated: 12/Jan/24  Resolved: 02/Jul/19

Status: Closed
Project: Core Server
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Task Priority: Major - P3
Reporter: James Wahlin Assignee: Jacob Evans
Resolution: Fixed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Depends
Sprint: Query 2019-07-15
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 Description   

Propose an outline of how a map/reduce command will be translated into an aggregation. Will it just directly call the aggregation command after constructing some BSON request? Or will it enter at a lower level? What things will it skip if it does enter at a lower level?

As part of this we should also consider how a distributed MapReduce will work. Should it enter through cluster_aggregate.cpp or utilize some of the same helpers in cluster_aggregation_planner.cpp and sharded_agg_helpers.cpp.


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